In libzypp before August 2018 GPG keys attached to YUM repositories were not correctly pinned, allowing malicious repository mirrors to silently downgrade to unsigned repositories with potential malicious content.
Exploitability
AV:NAC:HPR:NUI:NScope
S:UImpact
C:HI:HA:L7.7/CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:LOther